Numbers k such that (5^k - 2^k)/3 is prime.

Terms

a(0) =2a(1) =5a(2) =7a(3) =13a(4) =19a(5) =37a(6) =59a(7) =67a(8) =79a(9) =307a(10) =331a(11) =599a(12) =1301a(13) =12263a(14) =12589a(15) =18443a(16) =20149a(17) =27983a(18) =281807a(19) =656657a(20) =795829a(21) =832151